Duane Rettig ([duane at franz.com], [support at franz.com]); adapted from Common Lisp the Language, second edition, pp 207-214.

A version of this module has been incorporated into Allegro CL since version 6.1, where it became the default underlying implementation for the interpreter. As of version 7.0, it has also become the underlying implementation for the compiler.

This module does not load into Allegro CL 7.0, due to some minor incompatibilities. But since every Allegro CL 7.0 lisp has a version of the module already loaded, the module can be used without having to install it.

This module is intended to work with all major CL implementations at a "level 1" state (see the Powerpoint presentation), and is known to work on CMUCL (18e and 19a), clisp (2.33.2), and SBCL (0.8.16). It compiles and loads on an old 4.1 version of Lispworks, but environment objects cannot be printed; a format bug is suspected. Later versions of LW should work, but we have no way of testing it.

Please feed back version info if you find later versions on which it works. Fixes for making the modules work in any lisp are welcome.

beta